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Provides approx. 1200 Volts at a few hundred Amps . One of the largest vacuum tubes. Pool of mercury in the base acts as a cathode, feeding the 3 side-arm anodes, one for each phase of a 3-phase supply. Three intermediate grids provide some control…

Small brass telescope. Part of something.

One of two tubes have a spiral glass feature; presumed to have been acquired as a set with five others

a substantial soft iron core wound with 10 coils (5 on each leg) wired in series aiding and joined to a copper bus and two brass thumbnuts. A horseshoe 'keeper' is separate

IDL Scaler 1800, 4 Push Button Switches: Start, Stop, Reset, Test; 5 Dekatrons; Type: 1800C, Serial No. 178, a range of inputs

4 anamorphic drawings on circular sheets of waxy paper. Small hole in centre of sheets:
1) Bird of paradise in blue, red and green.
2) stork in black and white with red beak and legs and green frog in its mouth
3) diagram of four overlapping…

mixture of items from 3 light bulbs to a block of wood

IDL Pulse Height Analyser "Pulse Height Analyser 1870" 2 Controls: Auto/Manual, Threshold; 1 channel width switch; with voltmeter 0 - 50V by Isotopes Development Ltd 1870A Serial Number 76. Blue crackle metal case.

Used with BBC computer. no makers name; with phone connection wire